Tashan Weir,now still in good condition after 1100 years of weather beating and storm whipping,has played the role of seawater holdback,fresh water conservancy,water diversion and discharge.

• 它山堰是全国重点文物保护单位，历经1100余年风霜雨雪水和洪水冲击，至今仍基本完好，继续发挥着阻咸、蓄淡、引水、泄洪的作用。